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diff --git a/src/dynamics/porousAdvectionDiffusionDynamics.hh b/src/dynamics/porousAdvectionDiffusionDynamics.hh
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+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2008 Orestis Malaspinas, Andrea Parmigiani
+ *  E-mail contact: info@openlb.net
+ *  The most recent release of OpenLB can be downloaded at
+ *  <http://www.openlb.net/>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public
+ *  License along with this program; if not, write to the Free
+ *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA  02110-1301, USA.
+*/
+
+/** \file
+ * A collection of dynamics classes (e.g. BGK) with which a Cell object
+ * can be instantiated -- generic implementation.
+ */
+#ifndef POROUS_ADVECTION_DIFFUSION_DYNAMICS_HH
+#define POROUS_ADVECTION_DIFFUSION_DYNAMICS_HH
+
+#include <algorithm>
+#include <limits>
+
+#include "porousAdvectionDiffusionDynamics.h"
+#include "core/util.h"
+#include "lbHelpers.h"
+
+namespace olb {
+
+
+//==================================================================//
+//========== BGK Model for porous Advection diffusion=======//
+//==================================================================//
+
+template<typename T, typename DESCRIPTOR>
+PorousAdvectionDiffusionBGKdynamics<T, DESCRIPTOR>::PorousAdvectionDiffusionBGKdynamics (
+  T omega, Momenta<T, DESCRIPTOR>& momenta, T tSolid )
+  : BasicDynamics<T, DESCRIPTOR>( momenta ),
+    _omega(omega), _tSolid(tSolid)
+{ }
+
+template<typename T, typename DESCRIPTOR>
+PorousAdvectionDiffusionBGKdynamics<T, DESCRIPTOR>::PorousAdvectionDiffusionBGKdynamics (
+  const UnitConverter<T,DESCRIPTOR>& converter, Momenta<T, DESCRIPTOR>& momenta, T tSolid )
+  : BasicDynamics<T, DESCRIPTOR>( momenta ),
+    _omega(converter.getLatticeRelaxationFrequency()), _tSolid(tSolid)
+{ }
+
+template<typename T, typename DESCRIPTOR>
+T PorousAdvectionDiffusionBGKdynamics<T, DESCRIPTOR>::computeEquilibrium( int iPop, T rho,
+    const T u[DESCRIPTOR::d], T uSqr ) const
+{
+  // does temperature need to be considered here?
+  return lbHelpers<T, DESCRIPTOR>::equilibriumFirstOrder( iPop, rho, u );
+}
+
+
+template<typename T, typename DESCRIPTOR>
+void PorousAdvectionDiffusionBGKdynamics<T, DESCRIPTOR>::collide( Cell<T, DESCRIPTOR>& cell,
+    LatticeStatistics<T>& statistics ) 
+{
+  T temperature = this->_momenta.computeRho( cell );
+
+  // apply temperature scaling
+  T* porosity = cell.template getFieldPointer<descriptors::POROSITY>();
+  temperature = scaleTemp(temperature, porosity[0]);
+
+  const T* u = cell.template getFieldPointer<descriptors::VELOCITY>();
+
+  T uSqr = lbHelpers<T, DESCRIPTOR>::
+           bgkCollision( cell, temperature, u, _omega );
+
+  statistics.incrementStats( temperature, uSqr );
+}
+
+template<typename T, typename DESCRIPTOR>
+T PorousAdvectionDiffusionBGKdynamics<T, DESCRIPTOR>::getOmega() const
+{
+  return _omega;
+}
+
+template<typename T, typename DESCRIPTOR>
+void PorousAdvectionDiffusionBGKdynamics<T, DESCRIPTOR>::setOmega( T omega )
+{
+  _omega = omega;
+}
+
+template<typename T, typename DESCRIPTOR>
+T PorousAdvectionDiffusionBGKdynamics<T,DESCRIPTOR>::computeRho(const Cell<T,DESCRIPTOR>& cell) const
+{
+  //T rho = this->_momenta.computeRho(cell);
+  //const T* porosity = cell.template getFieldPointer<descriptors::POROSITY>();
+  //return scaleTemp(rho, porosity[0]);
+  return this->_momenta.computeRho(cell);
+}
+
+template<typename T, typename DESCRIPTOR>
+T PorousAdvectionDiffusionBGKdynamics<T,DESCRIPTOR>::scaleTemp(const T temp, const T porosity) const
+{
+  T rho = porosity * temp + ( T(1) - porosity ) * _tSolid;
+  return rho;
+}
+
+
+} // namespace olb
+
+#endif